mac: Update cl_kernels workaround for 10.12
mac: Update cl_kernels workaround for 10.12

BUG=crashpad:120

Change-Id: If863a181cb0671a90752070a818efaa7eea89ff9
Reviewed-on: https://chromium-review.googlesource.com/353630
Reviewed-by: Robert Sesek <f55ad94e336f3a28322d0a25d280221ea9daf7a3@chromium.org>

chromium/crashpad,atom/crashpad,atom/crashpad,chromium/crashpad,chromium/crashpad,atom/crashpad